panic: tcp_output Stopped at db_enter+0x18: addq $0x8,%rsp TID PID UID PRFLAGS PFLAGS CPU COMMAND 166497 32156 32767 0x10 0 0 syz-executor.5 *125595 32156 32767 0x10 0x4000000 1 syz-executor.5 db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257befc) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000c1a910) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd8068ab7998,fffffd806ace1300,0,fffffd806ef26300) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd8068ab7998,0,ffff80002e49e560,0,fffffd806ef26300,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd8068ab7998,0,ffff80002e49e560,0,fffffd806ef26300,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff800022d477a8,3,ffff80002e49e6e0,0,ffff80002e49e7d0) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff800022d477a8,ffff80002e49e788,ffff80002e49e7d0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e49e850) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e49e850) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7b551461d00, count: 6 https://www.openbsd.org/ddb.html describes the minimum info required in bug reports. Insufficient info makes it difficult to find and fix bugs. ddb{1}> ddb{1}> set $lines = 0 ddb{1}> set $maxwidth = 0 ddb{1}> show panic *cpu1: tcp_output ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257befc) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000c1a910) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd8068ab7998,fffffd806ace1300,0,fffffd806ef26300) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd8068ab7998,0,ffff80002e49e560,0,fffffd806ef26300,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd8068ab7998,0,ffff80002e49e560,0,fffffd806ef26300,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff800022d477a8,3,ffff80002e49e6e0,0,ffff80002e49e7d0) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff800022d477a8,ffff80002e49e788,ffff80002e49e7d0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e49e850) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e49e850) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7b551461d00, count: -9 ddb{1}> show registers rdi 0 rsi 0x1 rbp 0xffff80002e49e1c0 rbx 0xffff800020dd9b8f rdx 0xffff800000be0980 rcx 0 rax 0xffff800022d477a8 r8 0x101010101010101 r9 0x8080808080808080 r10 0xffd8d59673637936 r11 0xf72c9581816b1579 r12 0xffff800020dd9990 r13 0 r14 0 r15 0x1 rip 0xffffffff823fc058 db_enter+0x18 cs 0x8 rflags 0x246 rsp 0xffff80002e49e1b0 ss 0x10 db_enter+0x18: addq $0x8,%rsp ddb{1}> show proc PROC (syz-executor.5) pid=125595 stat=onproc flags process=10 proc=4000000 pri=32, usrpri=80, nice=20 forw=0xffffffffffffffff, list=0xffff800022d46a88,0xffff800021289270 process=0xffff8000ffff10b8 user=0xffff80002e499000, vmspace=0xfffffd8068dcab98 estcpu=30, cpticks=0, pctcpu=0.0 user=0, sys=0, intr=0 ddb{1}> ps PID TID PPID UID S FLAGS WAIT COMMAND 85924 118900 88062 32767 2 0x10 syz-executor.2 85924 492215 88062 32767 3 0x4000090 fsleep syz-executor.2 244 510488 60021 32767 2 0x10 syz-executor.6 244 428800 60021 32767 3 0x4000090 fsleep syz-executor.6 244 108274 60021 32767 2 0x4000010 syz-executor.6 32156 166497 28252 32767 7 0x10 syz-executor.5 *32156 125595 28252 32767 7 0x4000010 syz-executor.5 15516 74423 80884 32767 2 0x10 syz-executor.3 15516 520596 80884 32767 3 0x4000090 fsleep syz-executor.3 73601 180338 75579 32767 2 0x10 syz-executor.4 73601 472981 75579 32767 3 0x4000090 fsleep syz-executor.4 73601 316964 75579 32767 3 0x4000090 netcon syz-executor.4 73601 66238 75579 32767 3 0x4000090 fsleep syz-executor.4 95375 336360 0 0 3 0x14200 bored sosplice 80884 206181 87363 32767 3 0x90 nanoslp syz-executor.3 60021 141788 67876 32767 3 0x90 nanoslp syz-executor.6 18825 328834 2424 32767 2 0x10 syz-executor.7 28252 191110 63000 32767 3 0x90 nanoslp syz-executor.5 2424 82479 50535 0 3 0x82 wait syz-executor.7 67876 299808 50535 0 3 0x82 wait syz-executor.6 63000 209559 50535 0 3 0x82 wait syz-executor.5 75579 517496 81648 32767 3 0x90 nanoslp syz-executor.4 77968 458969 30033 32767 3 0x90 nanoslp syz-executor.1 87363 191564 50535 0 3 0x82 wait syz-executor.3 88062 236667 7249 32767 3 0x90 nanoslp syz-executor.2 81648 44588 50535 0 3 0x82 wait syz-executor.4 7249 193515 50535 0 3 0x82 wait syz-executor.2 30033 26270 50535 0 3 0x82 wait syz-executor.1 16237 153164 26236 32767 3 0x90 nanoslp syz-executor.0 26236 212891 50535 0 3 0x82 wait syz-executor.0 50535 393297 33518 0 3 0x82 wait syz-fuzzer 50535 126353 33518 0 3 0x4000082 nanoslp syz-fuzzer 50535 20946 33518 0 3 0x4000082 thrsleep syz-fuzzer 50535 215353 33518 0 3 0x4000082 wait syz-fuzzer 50535 288962 33518 0 3 0x4000082 thrsleep syz-fuzzer 50535 376867 33518 0 3 0x4000082 wait syz-fuzzer 50535 44011 33518 0 3 0x4000082 wait syz-fuzzer 50535 324474 33518 0 3 0x4000082 wait syz-fuzzer 50535 455819 33518 0 3 0x4000082 thrsleep syz-fuzzer 50535 312782 33518 0 3 0x4000082 thrsleep syz-fuzzer 50535 61551 33518 0 3 0x4000082 wait syz-fuzzer 50535 500469 33518 0 3 0x4000082 wait syz-fuzzer 50535 101376 33518 0 3 0x4000082 wait syz-fuzzer 50535 177877 33518 0 3 0x4000082 thrsleep syz-fuzzer 50535 218964 33518 0 3 0x4000082 kqread syz-fuzzer 50535 480105 33518 0 3 0x4000082 thrsleep syz-fuzzer 33518 38257 66339 0 3 0x10008a sigsusp ksh 66339 103906 52845 0 3 0x9a kqread sshd 44013 196731 1 0 3 0x100083 ttyin getty 52845 49544 1 0 3 0x88 kqread sshd 22380 70236 72735 73 3 0x1100090 kqread syslogd 72735 413893 1 0 3 0x100082 netio syslogd 72783 199068 1 0 3 0x100080 kqread resolvd 76930 502735 14944 77 3 0x100092 kqread dhcpleased 96217 31664 14944 77 3 0x100092 kqread dhcpleased 14944 343892 1 0 3 0x80 kqread dhcpleased 21777 488401 0 0 3 0x14200 bored smr 87946 412892 0 0 2 0x14200 zerothread 40544 92776 0 0 3 0x14200 aiodoned aiodoned 66496 115267 0 0 3 0x14200 syncer update 33950 68173 0 0 3 0x14200 cleaner cleaner 34381 407305 0 0 3 0x14200 reaper reaper 39201 192750 0 0 3 0x14200 pgdaemon pagedaemon 34134 148914 0 0 3 0x14200 bored viomb 76935 250534 0 0 3 0x40014200 acpi0 acpi0 87388 300055 0 0 3 0x40014200 idle1 24663 34846 0 0 3 0x14200 bored softnet 52752 168358 0 0 3 0x14200 bored softnet 6990 128226 0 0 3 0x14200 bored softnet 77381 334276 0 0 3 0x14200 bored softnet 16776 387057 0 0 3 0x14200 bored systqmp 4028 132817 0 0 3 0x14200 bored systq 7037 411133 0 0 3 0x40014200 bored softclock 948 136584 0 0 3 0x40014200 idle0 1 48510 0 0 3 0x82 wait init 0 0 -1 0 3 0x10200 scheduler swapper ddb{1}> show all locks Process 32156 (syz-executor.5) thread 0xffff800022d477a8 (125595) exclusive rwlock netlock r = 0 (0xffffffff8292fbb0) #0 witness_lock+0x44d #1 sosend+0x500 sys/kern/uipc_socket.c:632 #2 sendit+0x65d sys/kern/uipc_syscalls.c:694 #3 sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 #4 syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] #4 syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 #5 Xsyscall+0x128 ddb{1}> show malloc Type InUse MemUse HighUse Limit Requests Type Lim devbuf 10209 6412K 6419K 78643K 11301 0 pcb 13 10K 12K 78643K 15 0 rtable 234 6K 6K 78643K 355 0 ifaddr 82 16K 16K 78643K 84 0 counters 56 35K 35K 78643K 56 0 ioctlops 0 0K 2K 78643K 36 0 iov 0 0K 16K 78643K 40 0 mount 1 1K 1K 78643K 1 0 log 0 0K 0K 78643K 4 0 vnodes 1271 79K 79K 78643K 1633 0 UFS quota 1 32K 32K 78643K 1 0 UFS mount 5 36K 36K 78643K 5 0 shm 2 1K 5K 78643K 12 0 VM map 2 1K 1K 78643K 2 0 sem 12 1K 1K 78643K 15 0 dirhash 12 2K 2K 78643K 12 0 ACPI 1697 195K 286K 78643K 12548 0 file desc 23 85K 121K 78643K 675 0 sigio 0 0K 0K 78643K 3 0 proc 56 78K 103K 78643K 463 0 subproc 104 6K 6K 78643K 104 0 NFS srvsock 1 0K 0K 78643K 1 0 NFS daemon 1 16K 16K 78643K 1 0 ip_moptions 0 0K 0K 78643K 28 0 in_multi 99 6K 6K 78643K 105 0 ether_multi 1 0K 0K 78643K 1 0 ISOFS mount 1 32K 32K 78643K 1 0 MSDOSFS mount 1 16K 16K 78643K 1 0 ttys 235 1049K 1049K 78643K 235 0 exec 0 0K 2K 78643K 700 0 tdb 3 0K 0K 78643K 3 0 pagedep 1 8K 8K 78643K 1 0 inodedep 1 32K 32K 78643K 1 0 newblk 1 0K 0K 78643K 1 0 VM swap 8 62K 62K 78643K 8 0 UVM amap 255 80K 95K 78643K 5722 0 UVM aobj 37 2K 2K 78643K 37 0 memdesc 1 4K 4K 78643K 1 0 crypto data 1 1K 1K 78643K 1 0 ip6_options 0 0K 0K 78643K 12 0 NDP 11 0K 2K 78643K 27 0 temp 124 4726K 4790K 78643K 4693 0 kqueue 12 18K 24K 78643K 63 0 SYN cache 2 16K 16K 78643K 2 0 ddb{1}> show all pools Name Size Requests Fail Releases Pgreq Pgrel Npage Hiwat Minpg Maxpg Idle plcache 128 22 0 0 1 0 1 1 0 8 0 rtpcb 120 37 0 34 1 0 1 1 0 8 0 rtentry 112 113 0 3 4 0 4 4 0 8 0 unpcb 144 461 0 448 6 5 1 4 0 8 0 syncache 296 11 0 11 4 3 1 1 0 8 1 tcpqe 32 74 0 74 1 1 0 1 0 8 0 tcpcb 768 228 0 156 9 1 8 8 0 8 0 arp 120 18 0 0 1 0 1 1 0 8 0 inpcb 368 750 0 739 16 9 7 13 0 8 6 nd6 48 26 0 2 1 0 1 1 0 8 0 kcovpl 48 8 0 0 1 0 1 1 0 8 0 art_heap8 4096 1 0 0 1 0 1 1 0 8 0 art_heap4 256 479 0 26 30 0 30 30 0 8 1 art_table 32 480 0 26 4 0 4 4 0 8 0 art_node 16 112 0 12 1 0 1 1 0 8 0 sysvmsgpl 40 36 0 36 1 1 0 1 0 8 0 semupl 112 5 0 5 1 1 0 1 0 8 0 semapl 112 10 0 0 1 0 1 1 0 8 0 shmpl 112 34 0 0 1 0 1 1 0 8 0 dirhash 1024 17 0 0 3 0 3 3 0 8 0 dino2pl 256 2490 0 1056 90 0 90 90 0 8 0 ffsino 272 2490 0 1056 96 0 96 96 0 8 0 nchpl 144 3509 0 1836 63 0 63 63 0 8 0 uvmvnodes 80 2603 0 0 54 0 54 54 0 8 0 vnodes 216 2603 0 0 145 0 145 145 0 8 0 namei 1024 12034 0 12034 1 0 1 1 0 8 1 percpumem 16 40 0 0 1 0 1 1 0 8 0 kstatmem 264 22 0 0 2 0 2 2 0 8 0 scxspl 216 9313 0 9313 11 8 3 8 0 8 3 plimitpl 152 506 0 483 3 1 2 2 0 8 1 sigapl 424 965 0 911 7 0 7 7 0 8 0 futexpl 64 4849 0 4844 1 0 1 1 0 8 0 knotepl 120 112 0 0 4 0 4 4 0 8 0 kqueuepl 216 113 0 105 1 0 1 1 0 8 0 pipepl 320 267 0 238 11 3 8 8 0 8 5 fdescpl 496 947 0 913 7 2 5 6 0 8 0 filepl 152 6777 0 6531 23 6 17 17 0 8 7 lockfpl 104 24 0 22 1 0 1 1 0 8 0 lockfspl 48 12 0 10 1 0 1 1 0 8 0 sessionpl 144 23 0 7 1 0 1 1 0 8 0 pgrppl 48 23 0 7 1 0 1 1 0 8 0 ucredpl 104 1543 0 1525 1 0 1 1 0 8 0 zombiepl 144 913 0 911 1 0 1 1 0 8 0 processpl 1064 965 0 911 5 1 4 5 0 8 0 procpl 672 2123 0 2046 10 2 8 8 0 8 1 sosppl 168 8 0 8 2 1 1 1 0 8 1 sockpl 488 1318 0 1291 36 24 12 20 0 8 8 mcl64k 65536 6 0 0 1 0 1 1 0 8 0 mcl16k 16384 5 0 0 1 0 1 1 0 8 0 mcl12k 12288 7 0 0 1 0 1 1 0 8 0 mcl9k 9216 2 0 0 1 0 1 1 0 8 0 mcl8k 8192 11 0 0 2 0 2 2 0 8 0 mcl4k 4096 10 0 0 2 0 2 2 0 8 0 mcl2k2 2112 2 0 0 1 0 1 1 0 8 0 mcl2k 2048 348 0 0 43 0 43 43 0 8 0 mtagpl 96 4 0 0 1 0 1 1 0 8 0 mbufpl 256 376 0 0 23 0 23 23 0 8 0 bufpl 288 4164 0 126 289 0 289 289 0 8 0 anonpl 24 179979 0 167525 120 18 102 103 0 186 19 amapchunkpl 152 16057 0 15379 39 5 34 34 0 158 2 amappl16 200 2506 0 2169 41 11 30 30 0 8 10 amappl15 192 172 0 164 1 0 1 1 0 8 0 amappl14 184 108 0 98 1 0 1 1 0 8 0 amappl13 176 219 0 214 1 0 1 1 0 8 0 amappl12 168 8 0 5 2 1 1 1 0 8 0 amappl11 160 357 0 335 2 0 2 2 0 8 1 amappl10 152 22 0 18 1 0 1 1 0 8 0 amappl9 144 496 0 491 1 0 1 1 0 8 0 amappl8 136 618 0 549 3 0 3 3 0 8 0 amappl7 128 132 0 110 1 0 1 1 0 8 0 amappl6 120 199 0 189 2 1 1 2 0 8 0 amappl5 112 448 0 432 1 0 1 1 0 8 0 amappl4 104 1237 0 1201 2 0 2 2 0 8 0 amappl3 96 2325 0 2262 2 0 2 2 0 8 0 amappl2 88 605 0 567 2 1 1 2 0 8 0 amappl1 80 25111 0 24380 20 3 17 20 0 8 0 amappl 88 5181 0 5008 6 1 5 5 0 92 0 dma4096 4096 1 0 1 1 1 0 1 0 8 0 dma1024 1024 1 0 0 1 0 1 1 0 8 0 dma256 256 6 0 6 1 1 0 1 0 8 0 dma128 128 253 0 253 1 1 0 1 0 8 0 dma64 64 6 0 6 1 1 0 1 0 8 0 dma32 32 7 0 7 1 1 0 1 0 8 0 dma16 16 18 0 17 1 0 1 1 0 8 0 aobjpl 72 36 0 0 1 0 1 1 0 8 0 uaddrrnd 24 948 0 914 1 0 1 1 0 8 0 uaddrbest 32 2 0 0 1 0 1 1 0 8 0 uaddr 24 948 0 914 1 0 1 1 0 8 0 vmmpekpl 168 11745 0 11687 3 0 3 3 0 8 0 vmmpepl 168 95070 0 92436 137 5 132 132 0 357 9 vmsppl 368 947 0 914 4 0 4 4 0 8 0 rwobjpl 56 27160 0 23166 60 0 60 60 0 8 2 pdppl 4096 1903 0 1828 125 44 81 93 0 8 6 pvpl 32 441840 0 424431 255 28 227 255 0 265 74 pmappl 248 947 0 914 4 1 3 3 0 8 0 extentpl 40 56 0 38 1 0 1 1 0 8 0 phpool 112 730 0 55 20 0 20 20 0 8 0 ddb{1}> machine ddbcpu 0 Stopped at x86_ipi_db+0x1a: addq $0x8,%rsp x86_ipi_db(ffffffff82933ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 end of kernel end trace frame: 0x7f7ffffc2000, count: 12 ddb{0}> trace x86_ipi_db(ffffffff82933ff0) at x86_ipi_db+0x1a sys/arch/amd64/amd64/db_interface.c:393 x86_ipi_handler() at x86_ipi_handler+0xb7 sys/arch/amd64/amd64/ipi.c:106 Xresume_lapic_ipi() at Xresume_lapic_ipi+0x23 end of kernel end trace frame: 0x7f7ffffc2000, count: -3 ddb{0}> machine ddbcpu 1 Stopped at db_enter+0x18: addq $0x8,%rsp db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257befc) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000c1a910) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd8068ab7998,fffffd806ace1300,0,fffffd806ef26300) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd8068ab7998,0,ffff80002e49e560,0,fffffd806ef26300,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd8068ab7998,0,ffff80002e49e560,0,fffffd806ef26300,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff800022d477a8,3,ffff80002e49e6e0,0,ffff80002e49e7d0) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff800022d477a8,ffff80002e49e788,ffff80002e49e7d0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e49e850) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e49e850) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7b551461d00, count: 6 ddb{1}> trace db_enter() at db_enter+0x18 sys/arch/amd64/amd64/db_interface.c:437 panic(ffffffff8257befc) at panic+0x177 sys/kern/subr_prf.c:198 tcp_output(ffff800000c1a910) at tcp_output+0x2cd2 sys/netinet/tcp_output.c:727 tcp_send(fffffd8068ab7998,fffffd806ace1300,0,fffffd806ef26300) at tcp_send+0xc4 sys/netinet/tcp_usrreq.c:953 sosend(fffffd8068ab7998,0,ffff80002e49e560,0,fffffd806ef26300,0) at sosend+0x62a pru_send sys/sys/protosw.h:331 [inline] sosend(fffffd8068ab7998,0,ffff80002e49e560,0,fffffd806ef26300,0) at sosend+0x62a sys/kern/uipc_socket.c:646 sendit(ffff800022d477a8,3,ffff80002e49e6e0,0,ffff80002e49e7d0) at sendit+0x65d sys/kern/uipc_syscalls.c:694 sys_sendmsg(ffff800022d477a8,ffff80002e49e788,ffff80002e49e7d0) at sys_sendmsg+0x198 sys/kern/uipc_syscalls.c:601 syscall(ffff80002e49e850) at syscall+0x4c3 mi_syscall sys/sys/syscall_mi.h:101 [inline] syscall(ffff80002e49e850) at syscall+0x4c3 sys/arch/amd64/amd64/trap.c:585 Xsyscall() at Xsyscall+0x128 end of kernel end trace frame: 0x7b551461d00, count: -9